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| Amphiprora lepidoptera var. delicatula ‘Greville’ Desikachary 1989 |
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| Amphora neomarina Desikachary & Prema in Desikachary 1989 |
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| Auliscus sculptus var. major Desikachary 1989 |
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| Auliscus sculptus var. nankoorensis (Desikachary & Ranjitha Devi in Desikachary) Desikachary 1989 |
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| Biddulphia moronensis (Greville) T.V. Desikachary 1989 |
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| Diploneis aestiva f. major (H. Peragallo & M. Peragallo) T.V. Desikachary 1989 |
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| Navicula geitleri var. asymmetrica (Heiden) Desikachary et Sridharan in Desikachary 1989 |
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| Navicula lyra var. asymmetrica Desikachary et Prema in Desikachary 1989 |
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| Navicula spectabilis var. constricta Desikachary et Prema in Desikachary 1989 |
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| Navicula spectabilis var. punctata Desikachary et Prema in Desikachary 1989 |
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| Nitzschia kanayae (‘kanayai’) T.V. Desikachary & S. Gowthaman in T.V. Desikachary 1989 |
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| Nitzschia pseudocapitata Desikachary & Gowthaman in Desikachary 1989 |
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| Pinnulariosigma raeana (Castracane) Desikachary, Raja Rao et Sridharan in Desikachary 1989 |
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| Plagiotropis lepidoptera var. delicatula (Greville) Desikachary 1989 |
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| Rhaphoneis krusadiensis Desikachary et Sridharan in Desikachary 1989 |
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| Stictodiscus parallelus var. madagascarensis (Grunow) Desikachary 1989 |
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| Surirella lata var. contracta (Peragallo & Peragallo) Desikachary & Prema in Desikachary 1989 |
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| Synedra fasciculata var. parva (Kützing) Desikachary & Sridharan in Desikachary 1989 |
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| Thalassiosira blandus (A. Schmidt) Desikachary & Gowthaman in Desikachary 1989 |
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| Triceratium favus f. octogona Desikachary & Prema in Desikachary 1989 |
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| Trigonium arcticum var. californica (Grunow) Desikachary & Prema in Desikachary 1989 |
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| Trigonium arcticum f. quadrata (Grunow) Desikachary 1989 |
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| Trigonium arcticum f. tetragona (A. Schmidt) Desikachary 1989 |
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| Trigonium formosum f. tetragona Desikachary 1989 |
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| Trigonium latum var. dissimile (Grunow) Desikachary 1989 |
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| Trigonium moronense (Greville) Desikachary 1989 |
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| Trigonium reticulum f. tetragona (Grunow in Van Heurck) Desikachary 1989 |
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